Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method, performed by a first base station, for handling scheduling of Time Division Duplex (TDD) uplink or downlink subframes for a wireless terminal, wherein the wireless terminal is in dual connectivity with a first cell served by said first base station and a second cell served by a second base station, the method further comprising: identifying a subframe in which an uplink/downlink scheduling conflict will occur between the first cell and the second cell due to a difference between a TDD configuration of the first cell and a TDD configuration of the second cell; determining a scheduling for the identified subframe based on at least one scheduling parameter; and sending, to the second base station, a scheduling instruction comprising the determined scheduling for the identified subframe.
In wireless communication systems, dual connectivity allows a wireless terminal to simultaneously connect to multiple cells, such as a first cell served by a first base station and a second cell served by a second base station. However, when these cells operate with different Time Division Duplex (TDD) configurations, scheduling conflicts can arise in subframes where uplink and downlink transmissions overlap. This can lead to interference, reduced throughput, or dropped connections. To address this, a method is used by the first base station to manage TDD subframe scheduling conflicts. The method involves identifying a subframe where a scheduling conflict will occur due to mismatched TDD configurations between the first and second cells. The first base station then determines a scheduling solution for the conflicting subframe based on predefined scheduling parameters, such as priority rules, traffic load, or quality of service requirements. Finally, the first base station sends a scheduling instruction to the second base station, specifying the resolved scheduling for the identified subframe. This ensures coordinated uplink or downlink transmissions between the two cells, minimizing conflicts and improving communication reliability. The method may also involve dynamic adjustments to scheduling parameters to adapt to changing network conditions.
2. The method according to claim 1 , wherein the identifying further comprises analyzing the TDD configuration of each cell, including said first and second cells, serving the wireless terminal, wherein a frequency of the analyzing is dependent on a reconfiguration rate of each respective cell serving the wireless terminal.
This invention relates to wireless communication systems, specifically methods for identifying and managing time-division duplex (TDD) configurations in cellular networks to optimize performance for wireless terminals. The problem addressed is the dynamic nature of TDD configurations in cells, which can vary over time due to reconfiguration, leading to inefficiencies in communication and resource allocation. The method involves analyzing the TDD configuration of each cell serving a wireless terminal, including at least a first and a second cell. The analysis determines how frequently each cell's TDD configuration is reassessed, with the frequency of this analysis being adjusted based on the reconfiguration rate of each respective cell. Cells that reconfigure more frequently are analyzed more often, while those with stable configurations are analyzed less frequently. This adaptive approach ensures that the system remains aware of current TDD settings without unnecessary processing overhead. The method may also include determining the TDD configuration of a cell by receiving a system information block (SIB) from the cell, which contains the configuration details. Additionally, the method may involve adjusting the TDD configuration of a cell based on the analysis, such as modifying uplink and downlink subframe allocations to improve communication efficiency. The adaptive analysis frequency helps maintain optimal performance in dynamic network environments where TDD configurations may change due to traffic conditions, interference, or other factors.
3. The method according to claim 1 , further comprising maintaining a list of cells serving the wireless terminal and/or of base stations corresponding to the cells.
This invention relates to wireless communication systems, specifically methods for managing connections between wireless terminals and base stations. The problem addressed is efficiently tracking and updating the network topology as a wireless terminal moves between cells, ensuring seamless connectivity and accurate network management. The method involves maintaining a dynamic list of cells currently serving the wireless terminal and/or the corresponding base stations that control those cells. This list is continuously updated as the terminal moves, allowing the network to monitor its location and optimize resource allocation. The list may include identifiers for the cells and base stations, enabling the network to quickly determine the terminal's serving nodes and adjacent cells for handover decisions. Additionally, the method may involve tracking signal quality metrics, such as signal strength or interference levels, to assess the suitability of the serving cells. This data helps the network decide when to initiate handover procedures or adjust transmission parameters. The list may also be used to prioritize cells or base stations for future connections based on historical performance or load balancing requirements. By maintaining this list, the network can reduce handover failures, minimize signaling overhead, and improve overall system efficiency. The method ensures that the terminal remains connected to the most suitable cells while providing the network with real-time topology awareness. This approach is particularly useful in dense urban environments or high-mobility scenarios where frequent cell changes occur.
4. The method according to claim 1 , wherein the at least one scheduling parameter comprises a buffer state of the first base station for serving the first cell and/or a buffer state of the second base station for serving the second cell, and the determining further comprises scheduling the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective buffer state indicates a larger buffer level or amount of data to be processed or sent as compared to the respective buffer state for serving the other one of the first and second cells.
This invention relates to wireless communication systems, specifically methods for scheduling subframes in time division duplex (TDD) configurations where multiple base stations serve adjacent cells. The problem addressed is efficient resource allocation in heterogeneous networks where different base stations may have varying buffer states, leading to potential interference or underutilization of resources. The method involves determining scheduling parameters for at least one base station, including the buffer state of a first base station serving a first cell and/or the buffer state of a second base station serving a second cell. The buffer state indicates the amount of data waiting to be processed or transmitted. The method then identifies a subframe for scheduling based on the TDD configuration of the cells. The scheduling prioritizes the cell with the higher buffer level, ensuring that the subframe is allocated to the base station with more data to transmit. This dynamic adjustment helps optimize resource utilization and reduce interference by aligning scheduling decisions with real-time traffic demands. The approach is particularly useful in scenarios where adjacent cells operate under different TDD configurations, requiring coordinated scheduling to maintain network efficiency.
5. The method according to claim 1 , wherein the at least one scheduling parameter comprises an uplink resource request of the first base station serving the first cell and/or an uplink resource request of the second base station serving the second cell, and the determining further comprises: scheduling the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective uplink resource request is a larger one of the uplink resource requests or if such request surpasses a threshold.
This invention relates to wireless communication systems, specifically to methods for managing uplink resource scheduling in time division duplex (TDD) networks where multiple base stations serve adjacent cells with different TDD configurations. The problem addressed is efficient uplink resource allocation when neighboring cells operate under conflicting TDD configurations, which can lead to interference and suboptimal resource utilization. The method involves determining scheduling parameters for uplink resource requests from at least two base stations serving adjacent cells. Each base station operates with its own TDD configuration, defining specific subframes for uplink and downlink transmissions. The method identifies a subframe that is configured for uplink in one cell and downlink in the adjacent cell, creating a potential scheduling conflict. To resolve this, the method compares uplink resource requests from both base stations. The subframe is then scheduled according to the TDD configuration of the cell with the higher uplink resource demand, or if either request exceeds a predefined threshold. This ensures that uplink resources are allocated based on current traffic needs while minimizing interference between adjacent cells. The approach dynamically adapts scheduling decisions to prioritize cells with higher uplink demand, improving overall network efficiency.
6. The method according to claim 1 , wherein the at least one scheduling parameter comprises an upcoming uplink allocation made according to any one of the TDD configurations of the first and second cells in the identified subframe, and the determining further comprises: scheduling the identified subframe to receive only uplink communications.
This invention relates to wireless communication systems, specifically to methods for managing uplink and downlink scheduling in time-division duplex (TDD) configurations across multiple cells. The problem addressed is the need to efficiently coordinate uplink and downlink transmissions in TDD systems where different cells may operate under different TDD configurations, potentially leading to conflicts or inefficiencies in resource allocation. The method involves determining scheduling parameters for a subframe in a wireless communication system where at least two cells (a first cell and a second cell) are involved. The scheduling parameters include an upcoming uplink allocation for the subframe, which is determined based on the TDD configurations of the first and second cells. The method further involves analyzing these configurations to decide whether the subframe should be allocated exclusively for uplink communications. This ensures that uplink transmissions are properly scheduled without interference or conflicts, particularly in scenarios where different cells may have different uplink-downlink configurations for the same subframe. The approach helps optimize resource utilization and maintain synchronization in heterogeneous TDD networks.
7. The method according to claim 1 , wherein the at least one scheduling parameter comprises an identity of a preferred base station, and the determining further comprises: determining, from the first and second base stations, the identity of the preferred base station; and scheduling the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
In wireless communication systems, time-division duplex (TDD) configurations allow base stations to dynamically allocate uplink and downlink subframes. However, when a user device is served by multiple base stations with different TDD configurations, interference and scheduling conflicts can occur. This invention addresses the problem by enabling a user device to identify a preferred base station and schedule subframes based on the TDD configuration of the preferred base station's cell. The method involves determining a preferred base station from among at least two base stations serving the user device. The preferred base station is identified based on scheduling parameters, which include the base station's identity. Once identified, the user device schedules subframes according to the TDD configuration of the cell served by the preferred base station. This ensures that the user device aligns its uplink and downlink transmissions with the preferred base station's configuration, reducing interference and improving communication efficiency. The method may also involve additional steps, such as receiving TDD configurations from the base stations and selecting the preferred base station based on signal strength, load balancing, or other criteria. By dynamically adjusting scheduling based on the preferred base station, the invention enhances coordination between multiple base stations in heterogeneous networks.
8. The method according to claim 7 , wherein the identity of the preferred base station is statically determined.
A method for wireless communication involves selecting a preferred base station for a user device in a network environment where multiple base stations are available. The selection process is optimized to improve communication efficiency and reliability. The method includes determining the preferred base station based on predefined criteria, such as signal strength, network load, or geographical proximity. Once the preferred base station is identified, the user device establishes a connection with it, ensuring stable and efficient communication. The identity of the preferred base station is statically determined, meaning it is predefined and does not change dynamically during operation. This static determination simplifies the selection process and reduces the computational overhead associated with real-time evaluations. The method ensures that the user device consistently connects to the most suitable base station, enhancing overall network performance and user experience. The static determination approach is particularly useful in environments where network conditions are relatively stable, allowing for predictable and reliable connections.
9. The method according to claim 7 , wherein the identity of the preferred base station is dynamically determined, and said determining of the identity of the preferred base station is based on any one or more of: a location of the wireless terminal, base station traffic loads, and/or a type of transmitted data.
This invention relates to wireless communication systems, specifically methods for dynamically selecting a preferred base station for a wireless terminal to improve network efficiency and performance. The problem addressed is the static or suboptimal selection of base stations, which can lead to inefficient resource usage, increased latency, or degraded service quality. The method involves dynamically determining the identity of the preferred base station for a wireless terminal based on one or more factors. These factors include the terminal's location, the traffic loads of available base stations, and the type of data being transmitted. By considering these variables, the system can optimize network performance by directing the terminal to the most suitable base station at any given time. For example, if a terminal is near the edge of a cell, the system may prioritize a base station with lower traffic to reduce congestion. Similarly, for delay-sensitive data, the method may select a base station with the shortest path or lowest latency. The dynamic selection process ensures that the preferred base station is continuously reassessed, allowing the system to adapt to changing conditions such as terminal movement, fluctuating traffic loads, or varying data requirements. This approach enhances network efficiency, reduces unnecessary handovers, and improves overall user experience.
10. The method according to claim 1 , wherein the at least one scheduling parameter comprises a predetermined preference scheduling, wherein one of the first base station and the second base station is a preferred base station based on the predetermined preference scheduling, and the determining further comprises: determining the preferred base station according to the predetermined preference scheduling; and scheduling the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
In wireless communication systems, particularly those using Time Division Duplex (TDD) configurations, interference can occur between neighboring cells when their uplink and downlink subframes overlap. This problem is exacerbated when cells served by different base stations have mismatched TDD configurations. The invention addresses this by dynamically scheduling subframes based on a predetermined preference scheduling mechanism to minimize interference. The method involves identifying a subframe for communication in a first cell served by a first base station, where the first cell operates under a first TDD configuration. A second cell served by a second base station operates under a second TDD configuration, which may differ from the first. The method determines a preferred base station based on a predefined preference scheduling rule, which could prioritize one base station over the other based on factors like signal strength, load balancing, or network policies. The identified subframe is then scheduled according to the TDD configuration of the cell served by the preferred base station, ensuring alignment and reducing interference. This approach allows for flexible and adaptive scheduling, improving communication reliability and efficiency in heterogeneous network environments where multiple base stations with different TDD configurations coexist. The preference scheduling ensures that the most suitable base station's configuration is prioritized, optimizing resource allocation and minimizing conflicts.
11. The method according to claim 10 , wherein the predetermined preference scheduling is based on a round robin or proportional fair scheduling mechanism.
This invention relates to wireless communication systems, specifically methods for scheduling data transmissions to optimize resource allocation and fairness among users. The problem addressed is inefficient scheduling in wireless networks, which can lead to unfair resource distribution, degraded performance, and suboptimal use of available bandwidth. The method involves dynamically adjusting scheduling priorities for data transmissions based on predefined criteria. A key aspect is the use of a predetermined preference scheduling mechanism, which can be configured to prioritize certain users or data types. This ensures that critical transmissions are handled first while maintaining overall system efficiency. The scheduling mechanism can be implemented using either a round-robin or proportional fair scheduling algorithm. Round-robin scheduling ensures that each user gets an equal share of resources in a cyclic manner, promoting fairness. Proportional fair scheduling, on the other hand, balances between fairness and throughput by allocating resources based on user channel conditions and historical usage, optimizing overall network performance. The method dynamically selects the scheduling mechanism based on real-time network conditions, user requirements, and system policies. This adaptability allows the system to respond to varying demands, such as high-priority traffic or fluctuating user loads, while maintaining efficient resource utilization. The invention improves fairness, reduces latency, and enhances overall network performance in wireless communication environments.
12. A first base station, for handling scheduling of Time Division Duplex (TDD) uplink or downlink subframes for a wireless terminal, wherein the wireless terminal is in dual connectivity with a first cell served by said first base station and a second cell served by a second base station, the first base station configured to: identify a subframe in which an uplink/downlink scheduling conflict will occur between the first cell and the second cell due to a difference between a TDD configuration of the first cell and a TDD configuration of the second cell; determine a scheduling for the identified subframe based on at least one scheduling parameter; and send, to the second base station, a scheduling instruction comprising the determined scheduling for the identified subframe.
In wireless communication systems, dual connectivity allows a wireless terminal to connect to multiple cells simultaneously, improving data rates and reliability. However, when the cells operate with different Time Division Duplex (TDD) configurations, scheduling conflicts can arise in subframes where uplink and downlink transmissions overlap. This can lead to interference, reduced throughput, or dropped connections. To address this, a first base station handles TDD subframe scheduling for a wireless terminal in dual connectivity with a first cell (served by the first base station) and a second cell (served by a second base station). The first base station identifies subframes where scheduling conflicts occur due to mismatched TDD configurations between the two cells. It then determines an appropriate scheduling for the conflicting subframe based on predefined scheduling parameters, such as priority rules, traffic type, or quality of service requirements. The first base station sends a scheduling instruction to the second base station, specifying the resolved scheduling for the conflicting subframe. This ensures coordinated uplink or downlink transmissions, minimizing interference and maintaining seamless connectivity. The solution enhances dual connectivity performance by dynamically resolving TDD conflicts between cells.
13. The first base station according to claim 12 , wherein the first base station is configured to identify the subframe by further being configured to analyze the TDD configuration of each cell, including said first and second cells, serving the wireless terminal, and wherein the first base station is further configured to analyze the TDD configuration in a frequency that is dependent on a reconfiguration rate of each respective cell serving the wireless terminal.
This invention relates to wireless communication systems, specifically to managing time-division duplex (TDD) configurations in heterogeneous networks where a wireless terminal is served by multiple cells, including a first and a second cell. The problem addressed is ensuring efficient and accurate identification of subframes in TDD configurations, particularly when cells serving the same terminal may have different TDD configurations or may be reconfigured at different rates. The first base station is configured to identify subframes by analyzing the TDD configuration of each cell serving the wireless terminal. This analysis includes examining the TDD configurations of both the first and second cells. The base station further adjusts the frequency of this analysis based on the reconfiguration rate of each cell. For cells that are reconfigured more frequently, the analysis is performed more often to ensure up-to-date subframe identification. This dynamic adjustment helps maintain synchronization and avoid interference in the network, especially in scenarios where cells may have different TDD configurations or where configurations change over time. The solution optimizes resource utilization and improves communication reliability in heterogeneous wireless environments.
14. The first base station according to claim 12 , further being configured to maintain a list of cells serving the wireless terminal and/or of base stations corresponding to the cells.
This invention relates to wireless communication systems, specifically improving mobility management for wireless terminals in cellular networks. The problem addressed is efficiently tracking and managing the cells and base stations serving a wireless terminal as it moves through the network, ensuring seamless connectivity and reducing signaling overhead. The invention describes a first base station that communicates with a wireless terminal and maintains an updated list of cells currently serving the terminal. This list includes the cells themselves and the corresponding base stations that control those cells. The base station uses this list to optimize handover decisions, coordinate with neighboring base stations, and ensure continuous service as the terminal transitions between cells. The list is dynamically updated as the terminal moves, allowing the network to anticipate and prepare for handovers, reducing latency and improving reliability. The system may also involve other base stations that participate in maintaining this list, ensuring that multiple nodes in the network have synchronized information about the terminal's current and potential serving cells. This coordination helps prevent service disruptions and improves overall network efficiency by minimizing redundant signaling and unnecessary resource allocation. The invention is particularly useful in dense urban environments or high-mobility scenarios where frequent handovers are common.
15. The first base station according to claim 12 , wherein the at least one scheduling parameter comprises a buffer state of the first base station for serving the first cell and/or a buffer state of the second base station for serving the second cell, and the first base station is configured to determine the scheduling by further being configured to schedule the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective buffer state indicates a larger buffer level or amount of data to be processed or sent as compared to the respective buffer state for serving the other one of the first and second cells.
This invention relates to wireless communication systems, specifically to dynamic scheduling in Time Division Duplex (TDD) networks where multiple base stations serve adjacent cells with different TDD configurations. The problem addressed is efficient resource allocation in heterogeneous TDD environments, where mismatched TDD configurations between neighboring cells can lead to interference and suboptimal data transmission. The invention involves a first base station serving a first cell with a specific TDD configuration, adjacent to a second base station serving a second cell with a different TDD configuration. The first base station identifies a subframe where the TDD configurations conflict and determines scheduling based on buffer states. The buffer state reflects the amount of data waiting to be processed or transmitted in each base station. The first base station prioritizes scheduling the identified subframe for the cell with the higher buffer level, ensuring that the cell with more pending data receives priority in conflicting subframes. This dynamic approach optimizes resource utilization by aligning scheduling decisions with real-time traffic demands, reducing latency and improving overall network efficiency. The solution is particularly useful in dense deployments where TDD mismatches are common.
16. The first base station according to claim 12 , wherein the at least one scheduling parameter comprises an uplink resource request of the first base station serving the first cell and/or an uplink resource request of the second base station serving the second cell, and the first base station is configured to determine the scheduling by further being configured to schedule the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective uplink resource request is a larger one of the uplink resource requests or if such request surpasses a threshold.
This invention relates to wireless communication systems, specifically to dynamic time-division duplex (TDD) scheduling in heterogeneous networks where multiple base stations serve adjacent cells with different TDD configurations. The problem addressed is efficient resource allocation in scenarios where uplink traffic demands vary between cells, leading to potential interference or underutilization of resources. The invention involves a first base station serving a first cell with a specific TDD configuration, adjacent to a second cell served by a second base station with a different TDD configuration. The first base station identifies a subframe where the TDD configurations conflict or overlap and evaluates uplink resource requests from both cells. The scheduling decision prioritizes the cell with the higher uplink resource request or selects the subframe if the request exceeds a predefined threshold. This ensures that uplink resources are allocated based on real-time traffic demands, optimizing network performance and reducing interference. The system dynamically adjusts scheduling by considering uplink traffic loads from both cells, allowing flexible adaptation to varying demand patterns. This approach improves spectral efficiency and minimizes conflicts in heterogeneous TDD networks.
17. The first base station according to claim 12 , wherein the at least one scheduling parameter comprises an upcoming uplink allocation made according to any one of the TDD configurations of the first and second cells in the identified subframe, and the first base station is configured to determine the scheduling by further being configured to schedule the identified subframe to receive only uplink communications.
This invention relates to wireless communication systems, specifically to managing uplink and downlink scheduling in Time Division Duplex (TDD) configurations for base stations serving multiple cells. The problem addressed is ensuring proper scheduling of uplink and downlink transmissions in shared subframes when multiple TDD configurations are used across different cells, which can lead to conflicts or inefficient resource utilization. The invention involves a first base station that schedules communications in a shared subframe between a first cell and a second cell, where the cells may operate under different TDD configurations. The base station determines scheduling parameters for the shared subframe, including an upcoming uplink allocation based on the TDD configurations of both cells. The base station is configured to prioritize uplink communications in the identified subframe, ensuring that the subframe is used exclusively for receiving uplink transmissions. This avoids interference and ensures efficient use of resources by aligning the scheduling with the TDD configurations of the involved cells. The solution helps maintain synchronization and proper resource allocation in heterogeneous TDD environments.
18. The first base station according to claim 12 wherein the at least one scheduling parameter comprises an identity of a preferred base station, and the first base station is configured to determine the scheduling by further being configured to determine, from the first and second base stations, the identity of the preferred base station; and to schedule the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
This invention relates to wireless communication systems, specifically to dynamic scheduling of subframes in time-division duplex (TDD) networks where multiple base stations serve overlapping cells. The problem addressed is efficient resource allocation in heterogeneous networks where different base stations may operate under different TDD configurations, leading to interference and suboptimal performance. The invention involves a first base station that schedules subframes in a TDD network by considering at least one scheduling parameter, which includes the identity of a preferred base station. The first base station determines the preferred base station from among itself and a second base station. Once the preferred base station is identified, the first base station schedules the subframe according to the TDD configuration of the cell served by the preferred base station. This ensures that scheduling decisions align with the TDD configuration of the most suitable base station, reducing interference and improving overall network performance. The preferred base station may be selected based on factors such as signal strength, load balancing, or other network conditions. The invention enhances coordination between base stations in TDD networks, particularly in scenarios with overlapping coverage areas.
19. The first base station according to claim 18 , wherein the first base station is configured to determine the identity of the preferred base station statically.
20. The first base station according to claim 18 , wherein the first base station is configured to determine the identity of the preferred base station dynamically and based on any one or more of: a location of the wireless terminal, base station traffic loads, and/or a type of transmitted data.
This invention relates to wireless communication systems, specifically improving network efficiency and performance by dynamically selecting a preferred base station for a wireless terminal. The problem addressed is the static assignment of base stations, which can lead to suboptimal resource utilization, increased latency, and degraded service quality due to factors like terminal mobility, varying traffic loads, and different data types requiring distinct network handling. The system includes a first base station that dynamically determines the identity of a preferred base station for a wireless terminal. This determination is based on one or more factors, including the terminal's location, the traffic loads of available base stations, and the type of data being transmitted. By dynamically adjusting the preferred base station, the system optimizes network performance by ensuring the terminal connects to the most suitable base station at any given time. This reduces unnecessary handovers, balances network load, and improves data transmission efficiency, particularly for latency-sensitive or high-bandwidth applications. The dynamic selection process enhances overall network reliability and user experience by adapting to real-time conditions.
21. The first base station according to claim 12 , wherein the at least one scheduling parameter comprises a predetermined preference scheduling, wherein one of the first base station and the second base station is a preferred base station based on the predetermined preference scheduling, and the first base station is configured to determine the scheduling by being configured to determine the identity of the preferred base station according to the predetermined preference scheduling; and to schedule the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
This invention relates to wireless communication systems, specifically to scheduling subframes in time-division duplex (TDD) configurations where multiple base stations serve adjacent cells. The problem addressed is ensuring efficient and conflict-free scheduling of subframes in TDD networks, particularly when neighboring cells have different TDD configurations, which can lead to interference and reduced performance. The invention involves a first base station that communicates with a second base station to coordinate scheduling of subframes in their respective cells. The base stations exchange scheduling parameters, including a predetermined preference scheduling rule that designates one of the base stations as a preferred base station. The first base station determines the preferred base station based on this rule and then schedules a subframe according to the TDD configuration of the cell served by the preferred base station. This ensures that scheduling decisions align with the TDD configuration of the preferred base station, reducing interference and improving coordination between adjacent cells. The predetermined preference scheduling may be based on factors such as network load, signal quality, or administrative policies. The invention enhances TDD network performance by dynamically adapting scheduling to the preferred base station's configuration.
22. The first base station according to claim 21 , wherein the predetermined preference scheduling is based on a round robin or proportional fair scheduling mechanism.
This invention relates to wireless communication systems, specifically to a first base station that manages scheduling of communication resources for user devices. The problem addressed is efficient allocation of resources to optimize network performance while ensuring fairness among users. The first base station includes a scheduler configured to assign communication resources to user devices based on a predetermined preference scheduling mechanism. This mechanism prioritizes certain users or traffic types to improve quality of service or network efficiency. The scheduler may also consider channel conditions, user device capabilities, or service requirements when allocating resources. Additionally, the first base station may coordinate with other base stations to avoid interference and ensure seamless handover of user devices between cells. The predetermined preference scheduling can be implemented using a round robin or proportional fair scheduling mechanism. Round robin ensures each user gets equal access to resources in a cyclic manner, while proportional fair scheduling balances between fairness and throughput by allocating resources based on user demand and channel conditions. This approach helps maintain network stability and user satisfaction in dynamic wireless environments.
23. A method, performed by a second base station, for scheduling Time Division Duplex (TDD) uplink or downlink subframes for a wireless terminal, wherein the wireless terminal is in dual connectivity with a first cell served by a first base station and a second cell served by the second base station, the method comprising: receiving, from the first base station, a scheduling instruction for an identified subframe in which an uplink/downlink scheduling conflict will occur between the first cell and the second cell due to a difference between a TDD configuration of the first cell and a TDD configuration of the second cell, said scheduling instruction being based on at least one scheduling parameter; and scheduling the identified subframe according to the received scheduling instruction.
This invention relates to wireless communication systems, specifically addressing scheduling conflicts in Time Division Duplex (TDD) configurations for wireless terminals in dual connectivity. The problem arises when a wireless terminal is connected to two cells with different TDD configurations, leading to uplink/downlink scheduling conflicts in overlapping subframes. The invention provides a method for resolving these conflicts by coordinating scheduling decisions between the base stations of the two cells. The method is performed by a second base station serving a second cell, where the wireless terminal is simultaneously connected to both the second cell and a first cell served by a first base station. The second base station receives a scheduling instruction from the first base station for an identified subframe where a conflict would otherwise occur due to mismatched TDD configurations. The instruction is based on at least one scheduling parameter, which may include priority rules, traffic type, or quality of service requirements. The second base station then schedules the identified subframe according to the received instruction, ensuring consistent and conflict-free communication. This approach prevents interference and ensures efficient resource utilization in dual-connectivity scenarios.
24. The method according to claim 23 , wherein the at least one scheduling parameter comprises a buffer state of the first base station for serving the first cell and/or a buffer state of the second base station for serving the second cell, wherein the scheduling instruction indicates scheduling of the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective buffer state indicates a larger buffer level or amount of data to be processed or sent as compared to the respective buffer state for serving the other one of the first and second cells.
This invention relates to wireless communication systems, specifically methods for managing time-division duplex (TDD) configurations in heterogeneous networks where multiple base stations serve overlapping cells. The problem addressed is efficient scheduling of subframes in TDD systems to optimize data transmission when base stations have different buffer states, ensuring that resources are allocated based on the most urgent data demands. The method involves coordinating scheduling between a first base station serving a first cell and a second base station serving a second cell, where both cells operate under different TDD configurations. A scheduling parameter is used to determine which base station has a higher buffer level or more data to process. This parameter includes the buffer state of each base station, indicating the amount of data awaiting transmission. The scheduling instruction then prioritizes the subframe allocation for the base station with the higher buffer level, aligning the scheduling with the TDD configuration of the selected cell. This ensures that data transmission is optimized based on real-time buffer conditions, improving overall network efficiency and reducing latency. The approach is particularly useful in scenarios where overlapping cells must dynamically adjust to varying traffic loads.
25. The method according to claim 23 , wherein the at least one scheduling parameter comprises an uplink resource request of the first base station serving the first cell and/or an uplink resource request of the second base station serving the second cell, wherein the scheduling instruction indicates scheduling of the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective uplink resource request is a larger one of the uplink resource requests or if such request surpasses a threshold.
This invention relates to wireless communication systems, specifically to methods for managing uplink resource scheduling in heterogeneous networks where cells with different Time Division Duplex (TDD) configurations coexist. The problem addressed is efficient uplink resource allocation when multiple base stations serving adjacent cells have conflicting TDD configurations, leading to potential interference or underutilization of resources. The method involves a first base station serving a first cell with a first TDD configuration and a second base station serving a second cell with a second TDD configuration. The base stations exchange scheduling parameters, including uplink resource requests from each cell. A scheduling instruction is generated to allocate a subframe based on the TDD configuration of the cell with the higher uplink resource request, or if the request exceeds a predefined threshold. This ensures that the subframe is scheduled in a manner that prioritizes the cell with greater uplink demand, optimizing resource utilization and reducing interference. The solution dynamically adjusts scheduling decisions based on real-time uplink traffic demands, improving overall network efficiency in heterogeneous TDD environments. The method can be applied in scenarios where cells with different TDD configurations operate in proximity, such as in small cell deployments or multi-operator networks.
26. The method according to claim 23 , wherein the at least one scheduling parameter comprises an upcoming uplink allocation made according to any one of the TDD configurations of the first and second cells in the identified subframe, wherein the scheduling instruction indicates scheduling of the identified subframe to receive only uplink communications.
This invention relates to wireless communication systems, specifically methods for managing uplink and downlink scheduling in time-division duplex (TDD) configurations. The problem addressed involves coordinating uplink and downlink transmissions between multiple cells to avoid conflicts and improve efficiency. The invention provides a method for determining scheduling parameters for a subframe in a wireless communication system where at least two cells operate with different TDD configurations. The method identifies a subframe where the TDD configurations of the first and second cells differ, then evaluates scheduling parameters to determine whether the subframe should be allocated for uplink or downlink communications. The scheduling parameters include an upcoming uplink allocation based on the TDD configurations of the first and second cells. The method then generates a scheduling instruction to allocate the identified subframe for uplink communications only, ensuring that the subframe is used exclusively for receiving uplink data from user devices. This approach helps prevent interference and optimizes resource utilization in heterogeneous TDD networks. The method may also involve adjusting scheduling decisions dynamically based on real-time traffic conditions and network load.
27. The method according to claim 23 , wherein the at least one scheduling parameter comprises an identity of a preferred base station, said identity of the preferred base station being determined from the first and second base stations; and the scheduling instruction indicates scheduling of the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
This invention relates to wireless communication systems, specifically methods for managing time-division duplex (TDD) configurations in heterogeneous networks where multiple base stations serve overlapping cells. The problem addressed is ensuring efficient and conflict-free scheduling of subframes in TDD systems, particularly when user equipment (UE) is connected to multiple base stations with different TDD configurations. The solution involves determining a preferred base station from among at least two base stations serving a UE, where the preferred base station is selected based on predefined criteria. The identity of this preferred base station is used to select its TDD configuration for scheduling a specific subframe. This ensures that the subframe is scheduled according to the TDD configuration of the preferred base station's cell, avoiding conflicts and optimizing resource allocation. The method dynamically adapts to network conditions by leveraging the preferred base station's configuration, improving coordination between overlapping cells and enhancing overall system performance.
28. The method according to claim 27 , wherein the identity of the preferred base station is statically determined.
A method for wireless communication involves selecting a preferred base station for a mobile device in a network environment. The selection process includes dynamically determining the preferred base station based on signal strength, network load, or other performance metrics to optimize connectivity and resource allocation. In an alternative approach, the identity of the preferred base station is statically determined, meaning the selection is predefined and does not change dynamically. This static determination may be based on predefined rules, network configuration, or administrative settings, ensuring consistent connectivity for specific devices or regions. The method may also involve monitoring network conditions and adjusting the selection criteria to maintain optimal performance. The static determination approach simplifies network management by reducing the need for real-time decision-making, particularly in scenarios where predictable connectivity is prioritized over dynamic optimization. This method is applicable in cellular networks, Wi-Fi systems, or other wireless communication frameworks where efficient base station selection is critical for maintaining reliable service.
29. The method according to claim 27 , wherein the identity of the preferred base station is dynamically determined, and wherein the identity of the preferred base station is based on any one or more of: a location of the wireless terminal, base station traffic loads, and/or a type of transmitted data.
This invention relates to wireless communication systems, specifically methods for dynamically selecting a preferred base station for a wireless terminal. The problem addressed is the need to optimize network performance by intelligently choosing the best base station for a given terminal, considering factors such as location, traffic loads, and data type. The method involves dynamically determining the identity of the preferred base station for a wireless terminal. The selection is based on one or more criteria, including the terminal's location, the traffic loads of available base stations, and the type of data being transmitted. By evaluating these factors, the system can select the most suitable base station to improve network efficiency, reduce latency, and enhance overall communication quality. The dynamic determination ensures that the selection adapts to changing conditions, such as terminal movement or varying network loads, to maintain optimal performance. This approach helps balance network resources, reduce congestion, and improve user experience by ensuring the terminal connects to the most appropriate base station at any given time.
30. The method according to claim 23 , wherein the at least one scheduling parameter comprises a predetermined preference scheduling, wherein one of the first base station and the second base station is a preferred base station based on the predetermined preference scheduling, wherein the scheduling instruction provides scheduling of the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
This invention relates to wireless communication systems, specifically methods for managing time division duplex (TDD) configurations in heterogeneous networks where multiple base stations serve overlapping cells. The problem addressed is ensuring efficient and conflict-free scheduling of subframes in scenarios where different base stations operate with different TDD configurations, which can lead to interference and degraded performance. The method involves determining a preferred base station between a first and a second base station based on a predetermined preference scheduling rule. The preferred base station is selected to prioritize scheduling decisions. A subframe is identified for scheduling, and a scheduling instruction is generated to allocate the subframe according to the TDD configuration of the cell served by the preferred base station. This ensures that the subframe is scheduled in a manner that aligns with the preferred base station's TDD configuration, reducing interference and improving coordination between the overlapping cells. The predetermined preference scheduling may be based on factors such as signal strength, load balancing, or network policies to optimize overall system performance. The method ensures that scheduling decisions are consistent and aligned with the preferred base station's configuration, enhancing reliability and efficiency in heterogeneous network environments.
31. The method according to claim 30 , wherein the predetermined preference scheduling is based on a round robin or proportional fair scheduling mechanism.
This invention relates to wireless communication systems, specifically methods for scheduling data transmissions to optimize resource allocation and fairness among users. The problem addressed is ensuring efficient and equitable distribution of network resources in dynamic environments where multiple users compete for limited bandwidth. The method involves a scheduling mechanism that prioritizes data transmissions based on predefined criteria. The scheduling can be configured to operate in different modes, including a round robin approach, where each user is given equal access in a cyclic order, or a proportional fair scheduling mechanism, which balances throughput and fairness by allocating resources based on user demand and channel conditions. The system dynamically adjusts scheduling parameters to adapt to changing network conditions, such as varying user loads or signal quality, ensuring optimal performance and fairness. The method may also incorporate additional features, such as prioritizing certain users or traffic types based on service-level agreements or quality-of-service requirements. By dynamically adjusting scheduling policies, the system ensures that network resources are utilized efficiently while maintaining fairness among users. This approach is particularly useful in wireless networks where bandwidth is constrained and user demands fluctuate.
32. A second base station, for scheduling Time Division Duplex (TDD) uplink or downlink subframes for a wireless terminal, wherein the wireless terminal is in dual connectivity with a first cell served by a first base station and a second cell served by the second base station, the second base station configured to: receive, from the first base station, a scheduling instruction for an identified subframe in which an uplink/downlink scheduling conflict will occur between the first cell and the second cell due to a difference between a TDD configuration of the first cell and a TDD configuration of the second cell, said scheduling instruction being based on at least one scheduling parameter; and schedule the identified subframe according to the received scheduling instruction.
In wireless communication systems, dual connectivity allows a wireless terminal to simultaneously connect to two cells served by different base stations. However, when these cells operate with different Time Division Duplex (TDD) configurations, scheduling conflicts can arise in subframes where uplink and downlink transmissions overlap. This can lead to interference and degraded performance. To address this, a second base station is configured to manage TDD subframe scheduling for a wireless terminal in dual connectivity with a first cell (served by a first base station) and a second cell (served by the second base station). The second base station receives a scheduling instruction from the first base station for an identified subframe where a conflict would otherwise occur due to mismatched TDD configurations. The instruction is based on at least one scheduling parameter, such as priority rules or traffic type. The second base station then schedules the identified subframe according to the received instruction, ensuring coordinated uplink or downlink transmission without interference. This approach enables seamless dual connectivity by dynamically resolving TDD conflicts between the two cells.
33. The second base station according to claim 32 , wherein the at least one scheduling parameter comprises a buffer state of the first base station for serving the first cell and/or a buffer state of the second base station for serving the second cell, wherein the scheduling instruction indicates scheduling of the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective buffer state indicates a larger buffer level or amount of data to be processed or sent as compared to the respective buffer state for serving the other one of the first and second cells.
This invention relates to wireless communication systems, specifically to dynamic scheduling in heterogeneous networks where base stations operate with different Time Division Duplex (TDD) configurations. The problem addressed is efficient resource allocation in scenarios where adjacent cells, served by different base stations, have conflicting TDD configurations, leading to potential interference and suboptimal data handling. The invention involves a second base station that receives scheduling information from a first base station, including at least one scheduling parameter such as the buffer state of the first base station for its cell and/or the buffer state of the second base station for its own cell. The second base station then identifies a subframe where the TDD configurations of the two cells conflict. Based on the buffer states, the second base station determines which cell has a higher data load or buffer level. The scheduling instruction then prioritizes the subframe for the cell with the larger buffer level, ensuring that data processing or transmission is optimized for the cell with higher demand. This dynamic adjustment helps mitigate interference and improves overall network efficiency by aligning scheduling decisions with real-time traffic conditions. The solution is particularly useful in heterogeneous networks where flexible TDD configurations are employed to balance uplink and downlink traffic dynamically.
34. The second base station according to claim 32 , wherein the at least one scheduling parameter comprises an uplink resource request of the first base station serving the first cell and/or an uplink resource request of the second base station serving the second cell, wherein the scheduling instruction indicates scheduling of the identified subframe according to the TDD configuration of the one of the first and second cells, for which the respective uplink resource request is a larger one of the uplink resource requests or if such request surpasses a threshold.
This invention relates to wireless communication systems, specifically to interference management in heterogeneous networks where multiple base stations operate adjacent cells with different Time Division Duplex (TDD) configurations. The problem addressed is coordinating uplink resource allocation between neighboring cells to prevent interference when their TDD configurations differ, which can degrade performance. The invention describes a second base station that receives at least one scheduling parameter from a first base station serving a neighboring cell. These parameters include uplink resource requests from both the first and second base stations. The second base station identifies a subframe where interference may occur due to mismatched TDD configurations and schedules that subframe based on the cell with the higher uplink resource demand. If one cell's request exceeds a predefined threshold, the scheduling follows that cell's TDD configuration. This ensures that uplink resources are allocated efficiently while minimizing interference between cells. The solution dynamically adjusts scheduling based on real-time traffic demands, improving overall network performance in heterogeneous TDD environments.
35. The second base station according to claim 32 , wherein the at least one scheduling parameter comprises an upcoming uplink allocation made according to any one of the TDD configurations of the first and second cells in the identified subframe, wherein the scheduling instruction indicates scheduling of the identified subframe to receive only uplink communications.
This invention relates to wireless communication systems, specifically to methods for managing time-division duplex (TDD) configurations in heterogeneous networks where multiple base stations serve overlapping cells. The problem addressed is ensuring efficient uplink scheduling in scenarios where a user device may receive conflicting TDD configurations from different base stations, potentially causing interference or communication failures. The invention involves a second base station that coordinates with a first base station to manage uplink communications in a shared subframe. The second base station determines at least one scheduling parameter for an identified subframe, which includes an upcoming uplink allocation based on the TDD configurations of both the first and second cells. The scheduling instruction generated by the second base station designates the identified subframe to exclusively receive uplink communications, preventing downlink transmissions that could interfere with the uplink. This coordination ensures that the user device operates under a consistent TDD configuration, avoiding conflicts and optimizing resource utilization. The solution is particularly useful in small cell deployments where overlapping coverage areas require precise synchronization between base stations to maintain reliable communication links.
36. The second base station according to claim 32 , wherein the at least one scheduling parameter comprises an identity of a preferred base station, said identity of the preferred base station being determined from the first and second base stations; and the scheduling instruction indicates scheduling of the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
This invention relates to wireless communication systems, specifically to methods for managing time-division duplex (TDD) configurations in heterogeneous networks where multiple base stations serve overlapping cells. The problem addressed is ensuring efficient and conflict-free scheduling of subframes in TDD systems where different base stations may operate with different TDD configurations, leading to potential interference or resource conflicts. The invention involves a second base station that receives scheduling information from a first base station. The second base station determines a preferred base station between itself and the first base station, identified by an identity parameter. This identity is used to select the TDD configuration of the preferred base station's cell for scheduling a specific subframe. The scheduling instruction then ensures that the identified subframe is scheduled according to the TDD configuration of the preferred base station's cell, minimizing interference and optimizing resource allocation. This approach allows dynamic adaptation to varying TDD configurations in overlapping cells, improving network performance and reliability.
37. The second base station according to claim 36 , wherein the identity of the preferred base station is statically determined.
In wireless communication systems, mobile devices often need to switch between base stations to maintain connectivity. This process, known as handover, can be inefficient if the target base station is not optimally selected, leading to delays, dropped connections, or degraded performance. To address this, a second base station is configured to assist in handover decisions by identifying a preferred base station for a mobile device. The second base station determines the preferred base station based on predefined criteria, such as signal strength, load balancing, or network policies. Unlike dynamic selection methods, the identity of the preferred base station is statically determined, meaning it is predefined and does not change during operation. This static determination simplifies the handover process by reducing the need for real-time calculations, ensuring faster and more reliable handovers. The second base station communicates this preference to the mobile device or other network components, facilitating seamless transitions between base stations. This approach improves network efficiency and user experience by minimizing handover-related disruptions.
38. The second base station according to claim 36 , wherein the identity of the preferred base station is dynamically determined, and wherein the identity of the preferred base station is based on any one or more of: a location of the wireless terminal ( 10 ), base station traffic loads, and/or a type of transmitted data.
This invention relates to wireless communication systems, specifically improving handover decisions between base stations to optimize network performance. The problem addressed is inefficient handover management, which can lead to dropped connections, increased latency, or suboptimal resource utilization. The invention involves a second base station that dynamically selects a preferred base station for a wireless terminal based on multiple factors. The selection considers the terminal's location, traffic loads across base stations, and the type of data being transmitted. By dynamically adjusting the preferred base station, the system ensures better connectivity, reduced congestion, and improved data handling. For example, if a terminal is moving toward a less congested base station, the system may prioritize handover to that station, even if it is not the closest. Similarly, high-priority or latency-sensitive data may trigger a handover to a base station with lower latency capabilities. The dynamic selection process enhances overall network efficiency and user experience by adapting to real-time conditions.
39. The second base station according to claim 32 , wherein the at least one scheduling parameter comprises a predetermined preference scheduling, wherein one of the first base station and the second base station is a preferred base station based on the predetermined preference scheduling, wherein the scheduling instruction provides scheduling of the identified subframe according to the TDD configuration of a respective one of the first and second cells served by the preferred base station.
This invention relates to wireless communication systems, specifically to methods for managing time-division duplex (TDD) configurations in heterogeneous networks where multiple base stations serve overlapping cells. The problem addressed is ensuring efficient and conflict-free scheduling of subframes in TDD systems, particularly when different base stations may have different TDD configurations, leading to potential interference or resource conflicts. The invention involves a second base station that receives a scheduling instruction from a first base station. The scheduling instruction identifies a subframe and includes at least one scheduling parameter, such as a predetermined preference scheduling rule. This rule designates one of the base stations as a preferred base station. The scheduling instruction then directs the second base station to schedule the identified subframe according to the TDD configuration of the cell served by the preferred base station, whether that is the first or second base station. This ensures that subframe scheduling aligns with the TDD configuration of the preferred base station, reducing interference and improving coordination between the two cells. The invention enhances network performance by dynamically adapting scheduling based on predefined preferences, allowing for flexible and efficient resource allocation in TDD-based wireless networks.
40. The second base station according to claim 39 , wherein the predetermined preference scheduling is based on a round robin or proportional fair scheduling mechanism.
This invention relates to wireless communication systems, specifically to methods for scheduling data transmission in a network with multiple base stations. The problem addressed is efficient resource allocation to ensure fair and optimized data transmission between user devices and base stations, particularly in scenarios where multiple base stations serve the same user equipment (UE). The invention describes a second base station that communicates with a first base station to coordinate data transmission to a UE. The second base station receives scheduling information from the first base station, which includes data transmission preferences for the UE. These preferences determine how the second base station should allocate resources to the UE. The second base station then schedules data transmission to the UE based on these preferences, ensuring coordinated and efficient resource usage. The scheduling mechanism can be based on either a round robin or proportional fair scheduling algorithm. In round robin scheduling, each UE is given equal access to resources in a cyclic manner, ensuring fairness. In proportional fair scheduling, resources are allocated based on the UE's channel conditions and data requirements, optimizing throughput while maintaining fairness. The second base station applies the selected mechanism to determine the timing and allocation of resources for the UE's data transmission, improving overall network efficiency and user experience.
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January 2, 2018
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